Noack G. Berechnung hydrodynamisch geschmierter Gleitlager dargestellt [ 19] VDI Richtlinie ; Düsseldorf –  Lang O R, Steinhilper W. Gleitlager. VDI-Z. () 14, p. Lang, O.R.: Moderne Berechnungsverfahren bei der Auslegung von Dieselmotoren. 69 Lang, O.R.; Steinhilper, W.: Gleitlager. O.R. Lang and W. Steinhilper. Gleitlager. Springer, A. Boyaci, H. Hetzler, W . Seemann, C. Proppe, and J. Wauer. Analytical bifurcation analysis of a rotor.
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The result of the steinhiper using a Glyco 40 half-shell under slowly increasing continuous load, with a speed of 3, rpm, is represented in Figure 5. Measured parameters such as speed, driving torque, loading force, bearing rear temperatures and inlet lubricant temperature were determined.
In this instance, a bearing failure could be induced by applying slight loading forces. Maintenance Services and Products. Wissenschaftliche Berichte THZ Machine-specific data collection parameters and data management functions will need to be developed to enable integration of the right criteria, and identification of incipient failure. The noise emerging from metallic contacts between sliding surfaces is measured with emission acoustic sensors and further evaluated by spectral analysis.
Acoustic Emission Mean Amplitude vs. In the case of the impulse density measurement only the frequency is used, and in the case of the effective value langg only the amplitude is used. Sliding Bearing Test Bench. The frequency range gleitalger the noise emission extends from audible to ultrasonic. This range of measurements will not be taken into account in the subsequent signal evaluation. Figure 4 gletilager the frequency spectrum for an undamaged surface under hydrodynamic condition and slight load is shown against the frequency spectrum for a failed bearing.
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Metall 31Nr. The region up to the minimum of the Stribeck-curve is determined through boundary and mixed lubrication. In this region, the two machine surfaces are separated by a lubricant film. Damage can be recognized independently of contact geometry, sliding speed, shell-material, steonhilper shell temperature, and lubricant temperature with a significant increase of the amplitude in the frequency range around kHz.
Current Issue Archive Advertise. Result of Static Applied Load Test on Half-shell Glyco ssteinhilper Bearing In Figure 6, the value of this integral is given next to the progress courses of load, torque and bearing back temperature.
On the basis of these severities, this measurement procedure shows a large potential for a practical use in the early recognition of bearing failures. Acoustic Emission Analysis The evaluation of machines by noise monitoring in the audible sound range is a commonly used method. Further analysis is required to fully explain the extent to which each of the measured variables lagn the acoustic signal.
Monitoring Lubrication Regimes in Sliding Bearings
These vibrations are attributed to the noise emitted by the test bench motor. The spontaneous release of energy from a loaded elastic body is responsible for the emission of noise. By calculating the impulse density, conclusions on the existence of damages in bearings can be determined. Shaft Rotational Speed, Loading Force: Starting at the 16th test series, the amplitude in the range between 80 to kHz is clearly pronounced, showing the beginning of metallic contact between shaft and shell, and eventually leading to a bearing failure.
Bearing damage could always be recognized before the initial stage of a failure which was expressed by increasing torque. These results support an argument for the use of AE analysis to be used as a condition surveillance method for gleitlagfr bearings based on the correlation between the friction condition and the measuring average noise level.
Time Stejnhilper of the Frequency Spectra In Figure 5, the variation in time of every frequency spectral analysis is properly arranged.
This course corresponds with the progress of the Stribeck-curve which describes the correlation between sliding speed and friction coefficient in sliding contacts Figure 2. This causes a saturation of many machine components, for example, sliding bearings.
The possibility of preheating the lubricant facilitated a further reduction of the loading capacity of the bearing due to the viscosity decreasing as temperature rises. Failure-free running machines demand efficient and reliable monitoring systems, which can report on the current condition of the bearing arrangement while in operation.
In addition, steinhilperr slight increase of the amplitude between kHz and kHz is characteristic of the intact running bearings. The transferability of these results to nonstationary loaded bearings, for example in combustion engines, remains uncertain and its investigation could become the main purpose for further works.
The failure of a bearing in a ship motor may represent a threat to the machine, ship and environment, as well as to human lives. In experiments carried out with axial and radial bearings, a density of impulses was determined in order to evaluate the acoustic signal at high frequencies.
This procedure clarifies that gleitlagee the AE signal a bearing failure can be recognized seconds before it occurs. In Figure 5, the variation in time of every frequency spectral analysis is properly arranged. Toggle navigation Toggle search. In the audible sound range, environmental interferences are so large that the measuring signal is no longer useful.